How to collect HDD size and available or used space in linux cli?

Question

I'm trying to find some sort of command or regex to get the size and available or used space of a hard drive in linux.

At the moment I'm using this;

df -h

and getting something like this;

Filesystem            Size  Used Avail Use% Mounted on
/dev/sda1              10G  3.1G  6.4G  33% /
/dev/sda2             147G  5.8G  134G   5% /mnt

What I need is to be able to, per drive, collect the Size, Used and Avail values. Any thoughts on how I could go about collecting that data?

EDIT: Since I apparently wasn't quite clear enough, here's basically what I want the end result to be;

array(
    '/dev/sda1' => array(
        'size' => '10G', 'used' => '3.1G', 'avail' => '6.4G'
        ),
    '/dev/sda2' => array(
        'size' => '147G', 'used' => '5.8G', 'avail' => '134G'
        )
    )

Either that or each partition being in it's own separate array, rather than a master array.

Answer 1

You already have that information. df -m OR df -k to display it in megabytes or kilobytes, respectively.

If the output isn't exactly what you want, use other command-line tools (grep, sed, awk) to filter and format the output.

Of course, you have to mount the partition to get its used/avail space.

Answer 2

If you have root access then you can run fdisk -l /dev/sda to get a list of partitions on a device.

However, I don't see what you could want this information for. If you explained why you need it, that would let people give you better answers.

Answer 3

I figured out the answer to my own question;

Total:

df -h | sed -n 2p | awk '{print $2}'

Free:

df -h | sed -n 2p | awk '{print $4}'

Used:

df -h | sed -n 2p | awk '{print $3}'